Improvement in saw-mills



acfas/las' CHARLES M. FLl-N'l, OF HANCOCK, NEW HAMPSHIRE.

Letters Patent No. 110.451,'dated December 2,7, 1870.

IMPROVEMENT IN SAW-MILLS.

The Scheduleireforrevd to in these Letters Patent and makng'part of thesame.

To all persons to whom these presents may come Be it known that I,CHARLES M. FLINT, of Hancock, oi' the county ot' Hillsborough, of theState of New Hampshire, have made a new and useful invention, havingreference to Machinery for Sawing Lum ber, and I do hereby declare thesame to he fully described in the following specification, andrepresented in the accompanying drawing, of which- Figure 1 is a topview;

lligure 2, a front elevation Figure 3, a transverse section; and lFigure 4, an end elevation of the mechanism ih- Volvingr my invent-ion,the purpose of such mechanism being to hold or support a log and move itforward to a saw, as occasion may require, for sawing it up into boardsor lumber.

In the drawing- AA denote parallel,guide-ways or rails, having upon thema carriage, B, it being applied to them soV portI the log-clamping orclogging mechanism to be hereinafter described. v

A horizontal shai't, F, pivoted to the carriage B, and arrangedtherewith in manner as represented, carries two wheels, G G, which arearranged directly over the two hars D D, each wheel being connected tothe bar D beneath it by means ot' two steel belts or-bands, a b. end ot'each to the periphery ot' the wheel, wind in opposite directions aboutsuch periphery, and at their outer ends are fastened to the said bar D.

To one ot' the angle-bars D a toothed rack, H, is affixed.

A bar, I, arranged within the supporter C of the said bar D so as to becapable of sliding longitudinally, has two pawls, c d, pivotcd to it,such pawls being made to rest on the rack H, one being at the root of a`tooth of it, while the other is at the middle of another tooth.

A stud, e, extended down i'rm the slide I during the advance of thecarriage B, will be carried against a stationary inclined plane or cam,K, arranged as represented, and by such the pawl-slider will beretracted.

During une retreat or back movement of the carriage on its rails thesaid stud will be carried against another, but adjustable inclined planeor cam, L, arranged as represented.

These bands, attached at or near one- This cam projects upward from anvarm, f, which turns on a pivot, g, and causes an index pointer, h, tomove along a divided scale, t'.

Atangent-screw, k, properly applied to tlle arm, and a standard, l,serves to' move the arm, and thereby adjust the cam L, as may bedesirable.

By the action of the said cam the pawl-slider will be moved forward soas to advance the rack, and thereby cause, by the aid of theshaft-wheels and bands, as hereinbefore described, an advance movementof' the bar E.

Furthermore, there is fixed on the shaft F a spurwheel, M, with which aweighted catch-lever, N, pivoted to the carriage B, operates.

While the' stud e may be moving by either of the cams K L,the'catch-lever will be held out of engagement with the spur-wheel by acam, O, arranged as represented; but as soon as the longer arm of thecatch-lever may pass off the said cam O, such arm will drop and movethe. catch-arm up into engagement with the spur-wheel, and thereby holdthe shaft from being revolved, and of course the bar E, from being movedlaterally, while it may be further moved to carry a log into action withthe saw, which is to be supposed to be arranged in a proper position forsawing'lengthwise through the log dogged7 to the said bar.` y

There may be atlixed to the said bar a scale or graduated arm, S, bywhich, with au indicator, T, projected from the carriage B, the extentof lateral movement of the bar may be ascertained at any time. Thisscale and the indicator may be employed to aid with the adjustingmechanism of the cam L in effecting the proper adjustment of the cam tocause it to give any requisite movement to the pawl-slide. Therefore, inconnect-ion with the adjusting mechanism of the cam, the scale and theindicator become useful auxiliaries.

Furthermore,there is to he applied to the said bar a suitable number ofdogging mechanisms or devices for holding a' log in connection with thebar, one of such mechanisms being exhibited in the drawing, Figure 5being a veit-ical section ot' it and the bar E.

This dogging mechanism consists of two toothed jaws, 'ne a, formed asrepresented, extended from the rectangular plates o j, and arranged intwo right and left screws, q r, which are cut or made ou a vertical rod,t, provided with a head, 'r'.

rlhe larger of the plates o p rests on a vertical guide, s, applied tothe bar E, and made and so applied to the plate as to allow it, with thejaws and their screw-rod, to move freely up and down vertically.

Onrevolving the rod tin one direction the jaws will be caused toapproach each other, they being made to recede from one another when therod is re- Y volved in the opposite way.

A log, preparatory to being sawed oft' inte lumber, is to be laid on thegrooved bars C C ofthe frame B, and is to be held in connection with thebar E by the jaws of the clogging mechanisms, which, on the screwrodsbeing revolved in the right direction, will adapt themselves to the log,and gra-spit firmly on its opposite sides.

Owin,r to the peculiar construction of the (logging mechanism it will beseen that when one of its jaws, however set in the log, the other willcontinue to move toward the log until it may become set therein. It willalso be observed that while the iuuerhalf ot the log may be in the actofbeinr moved laterally otf the ends of the bars G C, the doggingmechanisms will be free to move downward, and will so nieve as to enablethe log to take a proper bearing on the uppermost parts ot' the saidends ot' the barsC C,

lian-thermore, it will be seen that as soon as the longer pawl, by itsaction against the rearmost tooth of the rack, may have advanced therack to the extent ot' the forward movement of the. pawl, no furtheradvance ot' the bar E and the log?r can take place, not- Y withstandingthe carriage B may continue in movement. Thus all danger ot' bringinrthe (logging and presenting and moving it, with reference to a saw, forthe. purpose ot' beingr sawed thereby into lumber,

Iclaim as my invention the tbllowing, that is to say l. The combinationand arrangement 0E the earriage B, its grooved ways C G, the bar orcarrier E, the jaws m n, right and left screws q fr, rod t, supportplates op, carrier and guide s, shaft F, wheels G G., bands a b a b,rack H, slider I, the pawl or pawls c d, stud e, cams K L, the toothedwheel M, catch-lever N, and cam O, the whole being applied and tooperate together, substantially in manne' as explained, so as toconstitute an improved head-,block i'or sawmills, whereby, by whoseoperation, a log may be sup ported and presented and moved withreference to a saw, in manner as explained.

2. The combina-tion for advancing the log bar E, the same consisting ofthe shaft F, wheels G G, bands a b a b, the rack H, the slider l, itspawl or pawls c (l, the sind e, andthe stationary cam K, and theadjustable cam L, the whole heini@r arranged substantially ill mannerand so as to operate z s set for'th.

v CEAS. M. FLIN T.

Witnesses:

1t. H. EDDY, J. 1t. Sxow.

